US5901561A - Fault restart method - Google Patents
Fault restart method Download PDFInfo
- Publication number
- US5901561A US5901561A US08/873,633 US87363397A US5901561A US 5901561 A US5901561 A US 5901561A US 87363397 A US87363397 A US 87363397A US 5901561 A US5901561 A US 5901561A
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- fault
- icemaker
- restart
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
- G05B23/0262—Confirmation of fault detection, e.g. extra checks to confirm that a failure has indeed occurred
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C1/00—Producing ice
- F25C1/12—Producing ice by freezing water on cooled surfaces, e.g. to form slabs
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2600/00—Control issues
- F25C2600/04—Control means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2700/00—Sensing or detecting of parameters; Sensors therefor
- F25C2700/04—Level of water
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24198—Restart, reinitialize, boot system after fault detection, hanging up, stalling
Definitions
- This invention relates to a method of automatically restarting operation of an icemaker after a fault has been detected, and if proper operation cannot be resumed within a predetermined number of restart tries, using the controller to generate a fault signal to an operator.
- Icemakers are used in a wide variety of commercial and residential applications. In commercial applications, icemakers are often used to produce large quantities of ice on a daily basis. In most instances, such icemakers operate continuously (i.e., 24 hours per day) such as in restaurants, hotels and in convenience stores.
- fault conditions may develop with commercial icemakers which necessitate resetting or restarting the icemaker. These fault conditions are often not serious fault conditions which necessitate the attendance of a qualified service person to restart the icemaker. Often, these fault conditions are relatively minor and may be due to such factors as electrical surge or brown-out conditions which could temporarily stress various operating components of the icemaker. Such conditions can also disrupt operation of the icemaker resulting in temporarily insufficient or excessive water levels in the water sump, temporarily excessively high or low temperatures of the gaseous refrigerant discharged from the compressor, etc.
- icemakers often generate a fault signal which indicates to the owner, attendant or other person of a business establishment where the icemaker is located that qualified service personnel is needed to correct the problem.
- Other icemakers upon detecting one or more of the above-mentioned fault conditions, require the operator to manually initiate some form of a restart operation or sequence which allows the icemaker to attempt to continue operation. In either instance, often the fault condition will abate within 15-60 minutes following its initial occurrence. If a service person has been summoned to the business establishment where the icemaker is located, and the fault condition has abated, this represents a cost to the establishment owner that is not needed.
- An icemaker which automatically attempts to restart, at least a limited number of times, before signalling a fault condition to an operator or attendant, would insure that service personnel are not summoned when only a temporary fault condition existed which does not require the attention of qualified service personnel, but which could be removed by simply performing one, two or more restarts of the icemaker over a time period sufficient to allow the temporary fault condition to abate.
- an automatic restart method for restarting operation of an icemaker after a fault condition has caused the icemaker to shut down in accordance with preferred methods of the present invention.
- the preferred methods provide a limited number of time delays and attempted restarts of the icemaker after a controller of the icemaker has detected a fault condition and shut down the icemaker. If after a limited number of attempts at restarting the icemaker the fault condition is still present, the methods of the present invention involve using the controller to signal that a fault condition has occurred and to shut down the icemaker. When this fault signal is provided, an operator or attendant of the icemaker is assured that the fault condition is one which will likely require the attention of qualified service personnel.
- the automatic shut down further ensures that the various components of the icemaker will not be damaged due to temporary power anomalies such as power surges or brown-out conditions.
- One method of the present invention generally involves incrementing a fault counter when a fault condition is detected which has caused the icemaker to shut down.
- a controller of the icemaker then waits a predetermined period of time before executing a restart sequence or routine. After the predetermined time period has expired, the controller executes the restart routine and an attempt is made to execute one complete cycle of operation (i.e., one complete "freeze” and one complete “harvest”). If one complete, subsequent cycle of operation is not completed without another fault condition being detected, then the fault counter is incremented and the controller again waits for the predetermined time period before executing the restart routine a second time. If a second restart of the icemaker results in a fault condition occurring before one complete cycle of operation is completed, then the fault counter is again incremented.
- a second timer is also included.
- the first timer is started if the fault condition was due to a water inlet fault. If the fault condition was not due to a water inlet fault, then the second timer is started. In this manner, different time periods can be selected as delay times, depending on the type of fault detected, before executing the restart routine.
- All of the above-described embodiments provide the advantage of waiting a predetermined length of time after the icemaker has shut down due to a fault condition, and then attempting to restart the icemaker, and execute one complete cycle of operation, at least a limited number of times. In this manner the operator or attendant can be insured that the fault condition is not one which requires the immediate attention of service personnel.
- the method of the present invention also does not require any input from an operator or attendant before attempting to restart the icemaker if a fault condition has occurred. A restart can be attempted relatively quickly after the fault condition has occurred regardless if the operator or attendant is aware that the fault condition has occurred, and even if the operator or attendant is too busy at the time to attempt to address the problem.
- FIG. 1 is a fragmentary perspective view of an icemaker positioned atop an ice bin, wherein the icemaker includes a system controller operated in accordance with a preferred method of the present invention
- FIG. 2 is a view of the control panel of the system controller providing the user accessible switches for initiating specific cycles of operation of the icemaker in manual fashion;
- FIG. 3 is a flowchart illustrating a preferred method of the present invention which enables a limited number of restarts of the icemaker to be attempted automatically upon sensing of a fault condition which has caused a shutdown of the icemakers;
- FIGS. 4 and 5 illustrate an alternative preferred method of the present invention.
- the icemaker 10 positioned on an ice bin 12.
- the icemaker 10 generally includes a water sump or reservoir 14 for containing a quantity of water therein, a water level sensor 16 in the form of a float for providing an indication of the level of water in the sump 14, and a water pump 18 for pumping the water in the sump up and over a plurality of evaporators 20.
- the water level sensor 16 provides a signal to a system controller 22 which uses the amount of water removed from the reservoir 14 as an indication of when it is time to enter a "HARVEST" cycle of operation.
- the system controller 22 also controls a water inlet valve 24 in order to admit water into the sump 14 as needed during "FREEZE” and "CLEAN" cycles of operation of the icemaker 10.
- the system controller 22 also controls operation of a compressor 26 which forces the refrigerant to flow through the evaporators 20 and the condenser (not shown) of the icemaker.
- a cube deflector 28 is provided which allows water running over the top of the evaporators 20 to fall through slots formed in the cube deflector 28 back into the sump 14, while causing ice which is released from the evaporators 20 during the harvest cycle to be directed into the ice bin 12 for temporary storage.
- the icemaker 10 can be viewed as having generally two major cycles of operation once powered up: FREEZE and HARVEST.
- FREEZE the water pump 18 and the compressor 26 are both turned on by the controller 22 to cause the water pump to pump water up to the tops of the evaporators 20 such that the water runs over the evaporators, which are being chilled by refrigerant running therethrough, to form ice cubes on the evaporators 20.
- the system controller 22 detects that the ice cubes are of sufficient size by signals received from the water level sensor 16 indicating the amount by which the water level in the sump 14 has dropped during the FREEZE cycle. Once a predetermined amount of water has been withdrawn from the water sump 14 during the FREEZE cycle, the controller 22 causes the HARVEST cycle to be entered.
- hot gas is directed from the compressor 26 through a hot gas solenoid valve (not shown) and into the evaporators 20 to heat the evaporators 20. Heating of the evaporators 20 eventually causes the ice cubes formed thereon to fall from the evaporators 20 onto the cube deflector 28 and into the ice bin 12.
- the hot gas from the compressor 26 is circulated through the evaporators 20 for a predetermined time to insure that all of the ice cubes have been released from the evaporators 20. More detailed information on the general operation of the icemaker 10 is provided in Appendix "A" appended hereto. It will be appreciated that the above description has been meant merely as an overview of the operation of the icemaker 10 and to provide a framework for the description of the method of the present invention to be described herein.
- the system controller 22 includes a control panel 30 having a plurality of indicator lights and manually actuatable push button switches 34-40.
- the indicator lights are LED indicators 34a-40a indicating “BIN FULL”, “FREEZE”, “HARVEST”, “CLEAN”, “OFF”, “WATER” and “REFRIGERATION”. Switches 34-40 may be actuated manually by a user. Pushing and releasing any one of pushbuttons 34-40 causes the selected function to be executed.
- LED indicators 42 (WATER) and 44 (REFRIGERATION) are provided to indicate fault conditions associated with a "water inlet fault” and a “refrigeration” fault, respectively.
- the "BIN FULL” LED when illuminated, indicates that the ice bin 12 (FIG. 1) is full.
- a fault restart routine 50 is illustrated in accordance with a preferred method of the present invention.
- the fault restart routine is entered whenever a fault is detected in the operation of the icemaker 10 which has caused the icemaker 10 to shut down.
- the Fault Restart Routine 50 causes the system controller 22 to wait for a predetermined time period and then to restart the icemaker 10, and to repeat this process a limited number of times in an effort to automatically resume operation of the icemaker.
- the system controller 22 turns off the compressor 26, the fan motor (not shown) or liquid line solenoid (not shown), the water pump 18, and closes the hot gas solenoid (not shown) and the water inlet solenoid valve 24.
- the hot gas solenoid is the solenoid valve disposed in the discharge line between the compressor discharge port and the input side of each of the evaporators 20, as is well known in the art.
- a "water inlet fault” is a fault involving the water inlet solenoid valve 24 (in FIG. 1) or a fault indicating that the water level in the sump 14 is too low. If this inquiry is “yes”, then the system controller 22 turns on the "OFF" LED (FIG. 2) and displays a fault code by lighting the "WATER” LED 42 (FIG. 2), as indicated at step 54.
- a WATER INLET FAULT RESTART TIME (WIFRT) timer is started, as indicated at step 56 and the system controller 22 waits for the predetermined WIFRT time period, as indicated at step 58, before turning on the water inlet solenoid valve 24, as indicated at step 60.
- the WIFRT timer is a timer having a duration of preferably about 20 minutes.
- a check is then made to determine if the water inlet fault condition has been cleared, as indicated at step 62 and, if so, the water inlet fault code is cleared, as indicated at step 64 and a "RESTART" sequence is initiated, as indicated at step 66.
- a description of the sequence of operation of the RESTART routine can be found at sections 2.5-2.5.6.4 in Appendix A.
- a "general fault condition” is one which, for example, might include a sensed fault condition involving the bin level sensor (not shown) of the icemaker 10, an excessively high discharge temperature of the gaseous refrigerant discharged from the compressor 26, or if the HARVEST cycle is sensed as not having been completed within a predetermined time period.
- the system controller 22 When a general fault condition has been detected, the system controller 22 turns on the "OFF" LED (FIG. 2) and displays a fault code by illuminating the "REFRIGERATION” LED 44 in FIG. 2, as indicated at step 68.
- a FAULT RESTART TRIES (FRT) counter is then incremented, as indicated at step 70, and the system controller 22 then checks to determine if the FRT counter equals a maximum preset count or value, as indicated at step 72.
- the FRT counter is a counter which keeps track of the number of times the icemaker 10 is restarted by the system controller 22 while in the fault restart routine 50.
- the maximum count or value of restart tries is a value in the EEPROM of the system controller 22 that determines how many consecutive times the controller 22 will attempt to restart the icemaker 10 after encountering a fault other than a water inlet fault. In the preferred method, this value is two, indicating that at least two restart tries are attempted automatically by the system controller 22.
- the FRT counter Assuming that the fault condition has just occurred and that, previously, the icemaker 10 had been operating properly, the FRT counter, at this point, will only have a value of "1". Accordingly, the inquiry at step 72 will produce a "no" answer. If the situation was otherwise, that is, if two restarts have already been made and the detected fault is one which does not involve a water inlet fault, then a third attempt at a restart would produce a "yes" answer at step 72. In this event, the system controller 22 would display a fault code, as indicated at step 74, and subsequently exit the Fault Restart Routine, as indicated at step 76. No further attempts at automatically restarting the icemaker 10 would be made by the system controller 22. At this point, the intervention of an operator or attendant would be required to manually reset the icemaker 10 by pressing the "OFF" button 40 (FIG. 2) to reset the icemaker before further restarts could be attempted.
- GFRT timer has a predetermined duration of preferably about 50 minutes. It will be appreciated, however, that the predetermined duration of the GFRT timer, as well as the duration of the WIFRT timer, could vary considerably.
- the predetermined time periods of the GFRT timer and the WIFRT timer thus represent the time delays which the system controller 22 waits after detecting either a water inlet fault or a general fault, respectively, before attempting to restart the icemaker 10.
- the system controller 22 waits until the GFRT timer has expired, as indicated at step 80, and then enters the RESTART sequence, as indicated at step 82.
- the system controller 22 monitors operation of the icemaker 10 to determine if one complete cycle of operation is executed without another fault being detected, as indicated at step 84.
- One complete subsequent cycle refers to a complete FREEZE cycle and a complete HARVEST cycle being executed without incurring any additional faults. If the icemaker was previously in the HARVEST cycle when the fault occurred, then it must execute one complete FREEZE cycle and follow with one complete HARVEST cycle without any further faults being detected. If the answer to the inquiry at step 84 is "yes", then the system controller 22 resets the FRT counter, clears the fault condition and exits the Fault Restart Routine, as indicated at step 86.
- the Fault Restart Routine 50 causes the system controller 22 to automatically initiate at least a limited number of restarts of the icemaker 10 if the icemaker shuts down because of a detected fault condition. If the fault is a water inlet fault, no limit is placed on the number of restarts which the system controller 22 will attempt; only that the system controller 22 wait for a predetermined time (about 20 minutes) before attempting each restart. If the detected fault is a fault other than a water inlet fault, the system controller 22 is required to wait for a second predetermined time period (i.e., about 50 minutes) before attempting each restart. Only a predetermined number of restarts will be made if the fault detected is a fault other than a water inlet fault.
- the predetermined times for the WIFRT timer and the GFRT timer could be varied significantly if desired.
- the times of 20 minutes and 50 minutes for the WIFRT timer and GFRT timer, respectively, have been selected because they represent time periods which have been found to be sufficient to allow various fault conditions to abate.
- the invention is not limited to the sensing of only certain types of faults.
- the method of the present invention can be used in connection with virtually any form of sensing device(s) to provide a number of restart tries before shutting down the icemaker 10.
- the present invention categorizes the type of fault as either a water inlet fault or some other form of fault, it will be appreciated that a greater or lesser categorization of the specific types of faults could be implemented, and a greater or lesser number of different time delay periods incorporated depending on the categorization of the sensed fault. Even further, the length of the time delay periods could be reduced or lengthened depending on the number of previous attempts at restarting the icemaker. Different numbers of restart tries could also be implemented depending on the type or categorization of detected fault.
- the method 100 provides the time delays and limited number of automatic restarts described in connection with the fault restart routine 50, but also includes an even greater degree of intelligent control.
- an inquiry is made if the fault occurred while the icemaker 10 was in the "CLEAN" cycle of operation, as indicated at step 104. If this inquiry produces a "yes” answer, then the fault condition is ignored, as indicated at step 106, and operation of the icemaker 10 is continued. If the inquiry produces a "no” answer, then a fault flag is set, as indicated at step 108, and the "OFF" LED is turned on and a fault code is displayed, as indicated at step 110. An inquiry is then made to determine if the detected fault is a "water inlet fault” as indicated at step 112. If it is, then the WIFRT timer is started, as indicated at step 114.
- the OFF switch is checked, as indicated at step 116, to determine if it has been depressed. If so, the fault flag previously set is cleared, as indicated at step 118 and the icemaker 10 enters the OFF mode, as indicated at step 120. If the inquiry at step 116 produces a "no" answer, the HARVEST, CLEAN and FREEZE switches are checked to determine if any one of these switches has been depressed by the operator, as indicated at step 122. If any one of these switches is detected as being depressed, the function associated with the depressed switch is ignored, as indicated in step 124.
- step 122 If the answer to the inquiry in step 122 is "no", then a check is made to determine if the WIFRT timer is timed out, as indicated at step 126. If so, the water inlet solenoid valve 24 is turned on to admit water into the sump 14, as indicated at step 128. A check is then made to determine if the sump 14 is full within a maximum "SUMP FILL TIME", as indicated at step 130. If the sump 14 is detected as being full within the SUMP FILL TIME, then the restart sequence is executed and the fault flag is reset, as indicated at step 132.
- step 130 If the sump is not detected as being full within the SUMP FILL TIME at step 130, then a jump is made back to step 114 and the WIFRT timer is restarted, as indicated at step 114, and steps 116, 122 and 126 are repeated. If the inquiry at step 126 produces a "no" answer, indicating that the WIFRT timer has not timed out, then the WIFRT timer is incremented, as indicated at step 134 and the switches are again checked at steps 116, 122 and 126.
- the FRT counter is incremented, as indicated at step 136. Referring now to FIG. 5, and a check is then made to determine if the FRT counter equals the maximum FRT count or value, as indicated at step 138. If this inquiry produces a "yes" answer, then the OFF key is checked to determine if it has been pressed by the operator, as indicated at step 140. If so, the fault flag is reset, the FRT counter is reset and both the GFRT and WIFRT timers are reset, as indicated at step 142. The icemaker 10 then enters the OFF state, as indicated in step 144.
- step 140 If the inquiry at step 140 indicates that the OFF key has not been pressed, then the FREEZE, CLEAN, and HARVEST switches are checked to determine if any one of these switches has been pressed, as indicated in step 146. If so, the depressed key is ignored, as indicated at step 148. If none of these switches has been pressed, then a jump is made back to step 140 to again check if the OFF switch has been pressed.
- the FRT counter does not equal the maximum FRT value or count, as checked at step 138, then the GFRT timer is started, as indicated at step 150.
- the OFF key is then checked to determine if it has been pressed, as indicated at step 152. If so, the fault flag is cleared, as indicated in step 154, and the machine enters the OFF mode, as indicated at step 156. If the HARVEST, CLEAN or FREEZE switches are pressed, as indicated at step 158, the depressed key is ignored, as indicated at step 160.
- a check is then made to determine if the GFRT timer has timed out, as indicated at step 162 and, if so, the fault restart sequence is executed, as indicated at step 164.
- Appendix A as follows, provides an even more detailed description of the various cycles of operation of the icemaker 10:
- ANTI-SLUSH PUMP OFF TIME The length of time that the water pump turns off for in order to promote the freezing of water to the evaporator plates during the freeze cycle.
- ANTI-SLUSH ENABLE CYCLES The number of freeze cycles in which the anti-slush feature is allowed to operate once the compressor is turned back on.
- BIN EMPTY TIME The amount of time that the controller remains in a Bin Full mode after the bin full condition is removed.
- BIN FULL MIN The amount of time that the Bin Full sensors must be blocked in order to register a bin full condition.
- CHECKSUM The binary value stored in EEPROM address 0 which when summed with EEPROM addresses 1 through 63 yields a binary value with the lower 8 bits of the summation equal to 255.
- CLEAN RINSE TIME The time which the sump water is circulated through the water distribution system before being flushed with fresh inlet water.
- CLEAN RINSE FILL TIME The time the water solenoid is opened to purge the system during the rinse cycle in CLEAN.
- DISCHARGE RATE MAX Maximum necessary rate that the discharge temperature must rise during the Freeze cycle.
- DISCHARGE TEMP VALUE Temperature value used to determine the End-Of-Cycle Fan Off Delay time to be used.
- DISCHARGE TEMP DELTA Minimum necessary increase in discharge line temperature in order to prevent a fault in operation from being assumed.
- DISCHARGE TEMP MAX Maximum allowable temperature seen by the Discharge Temperature Sensor for normal operation. An over heating failure of the discharge gas is assumed above this temperature.
- END-OF-CYCLE FAN OFF DELAY The time at the completion of a Freeze cycle where the condenser fan is turned off.
- EOCFOD VALUE (1-4): Time value used to control how long the condenser fan will remain off at the end of a Freeze cycle.
- FAULT RESTART TRIES An EEPROM value that determines how many consecutive times the controller will restart after encountering a fault other than a water fault.
- FLUSH % VALUE The stored EEPROM value at address 65 identifying which of the five flush percentages is to be used for determining system flush times.
- FAN OFF DELAY SET UP TIME The time into the Freeze cycle at which the End-Of-Cycle Fan Off Delay time, Fan cycling in Freeze and % Harvest Delay are determined.
- FIXED TIME DELAY BEFORE PUMP OFF In harvest, the time after time to last cube from the previous harvest cycle, when the water pump is turned off to prevent water cascading.
- FREEZE SUMP REFILL VALUE For systems that require more water deposited to the evaporator plates than what the sump can hold, it is the number of times that the sump will refill with water before initiating a Harvest sequence.
- FREEZE SUMP TEMP DROP DELTA Minimum necessary decrease in sump water temperature during freeze in order to prevent a fault in operation from being assumed.
- FREEZE SUMP TEMP DROP TIME The time into the Freeze cycle at which the temperature drop of the sump water is tested to determine if a fault condition exists.
- FREEZE TIME MAX Maximum allowed time for a freeze cycle to run before a fault in operation is assumed.
- GENERAL FAULT RESTART TIME The time the controller remains in the off mode after it encounters a fault prior to restarting. Sixteen times multiplier.
- HARVEST BIN BLOCKAGE SENSE The time value in a Harvest cycle used to determine if the Bin Full sensors detected a bin full situation as opposed to ice falling.
- HARVEST DELAY TIME PERCENTAGE (1-3): A percentage of harvest time to last cube used to determine harvest delay time. Percent value is based on discharge temperature.
- HARVEST DRAIN TUBE PURGE TIME The delay time after the water pump is turned on in harvest. If the sump drops below full during this time, the sump is refilled before flushing is started.
- HARVEST MAXIMUM TIME The time in harvest where the system will shut down on fault due to harvest problems. The system must have two consecutive cycles where harvest maximum time is reached before shutting down.
- HARVEST PUMP OFF TIME The time at the beginning of a Harvest cycle where the water pump is turned off.
- HARVEST TIME The time in harvest prior to starting the harvest delay timer. Under normal operation, the HARVEST TIME is defined as the time to last cube of the previous harvest cycle.
- LAST FAULT DETECTED The stored EEPROM value at address 66 which identifies the last fault mode that was detected by the controller.
- LAST OPERATING MODE The stored EEPROM value at address 64 which identifies the operating mode that the controller was in prior to losing power.
- MINIMUM HARVEST TIME DEFAULT A value used as harvest time when the system does not have a valid time to last cube. This value is defined such that an acceptable harvest occurs under all environmental conditions.
- RESTART HOT GAS VALVE OPEN The time during the Restart mode in which the hot gas valve remains opened.
- SUMP DROP TIME MAX Maximum allowed time for the water level in the sump to drop below the sump full position when the water pump is turned on.
- SUMP FILL TIME Time necessary to fill the sump with water from the harvest level to the full level.
- SUMP FILL TIME DEFAULT Time value used as the sump fill time when the actual sump fill time has not yet been determined.
- SUMP FILL TIME MAX The maximum allowed time to fill the sump before a fault in operation is assumed.
- SUMP TEMP LOW LIMIT The temperature value used to determine if the sump water has dropped low enough to make ice.
- VARIABLE FLUSH % VALUE (1-5) A percentage value used to calculate the length of time that the sump will be flushed with fresh water.
- WATER DISTRIBUTION TUBE DRAIN TIME The time that is needed to ensure that all water has drained from the distribution tube after the water pump is turned off.
- WATER INLET FAULT RESTART TIME The time that the controller remains idle in the Off mode before attempting to restart. This occurs only when shutdown was originally caused by the detection of a water inlet fault.
- WATER VALVE LEAK TIME The time that is waited in order to detect if the water inlet valve is leaking during freeze diagnostics.
- the controller When power is applied the controller will go through an initialization process. All display LED's will respond by first turning on for 1 second and then turning off for 1 second. During the initialization the controller will perform a self RAM check upon which a failure will result in a software reset. Secondly, the controller will detect whether it is receiving a 50 or 60 hertz signal and it will adjust its timing accordingly. Thirdly, the controller will check for a valid EEPROM checksum. An incorrect checksum will force the controller to remain in a shutdown state with outputs off until a valid checksum has been read eight consecutive times. An operating mode will then be selected which best duplicates the mode which was active when power to the controller was removed. All fault codes which were not previously acknowledged by the user will be displayed.
- the Freeze cycle shall be entered after normal Harvest cycle, Restart cycle, or after a bin full condition is cleared.
- 2.2.3.1 Open the water inlet solenoid and allow sump to fill to sump full level. If sump full is not detected within SUMP FILL TIME MAX seconds, set the water inlet solenoid fault flag and proceed to 2.9.2 (Water Fault). If both the sump full and sump harvest beams are blocked, continue filling until only sump full beam is blocked or SUMP FILL TIME MAX seconds has elapsed.
- the controller should operate as defined in section 2.9.3.1 Sump Temperature Fault. Keypress recognition will be limited to that described in section 2.13.
- This feature should be enabled for ANTI-SLUSH ENABLE CYCLES number of freeze cycles after restarting the compressor.
- the number of freeze cycles should be programmable from 0 to 254, and if programmed to 255 the routine should be performed every cycle.
- the flush time is a percentage of sump fill time. SUMP FILL TIME DEFAULT will be used if a sump fill time has not been measured.
- the flush level shall be adjustable, as described in 2.3.4.
- Variable Flush Adjustment--Flush level shall be adjustable from OFF mode only. If the OFF switch is continuously pressed for greater than 3 seconds but less than 6 seconds (when the machine is in OFF mode), the control shall acknowledge that flush level may be adjusted by flashing all mode indicators for 1 second on, 1 second off. The control shall then turn on the appropriate indicators, per the table 2.3.4, to indicate the present flush level. Flush level shall be changed to the next higher level, or to the lowest level from the highest level, when the FREEZE switch is pressed and released. The control shall return to OFF mode when the OFF switch is continuously pressed for greater than 3 seconds but less than 6 seconds or after 60 seconds of no switch inputs. When in FLUSH ADJUSTMENT mode, only OFF and FREEZE (to adjust flush level only) switch inputs shall be recognized (ie. HARVEST, and CLEAN switch inputs shall be ignored).
- the Restart sequence can be initiated by a software reset (watchdog timer), by pressing the FREEZE switch while in Shutdown, a timed period after a water inlet solenoid fault, or timed period after a General Fault, or by turning the power on.
- a software reset watchdog timer
- pressing the FREEZE switch while in Shutdown a timed period after a water inlet solenoid fault
- timed period after a General Fault or by turning the power on.
- the clean cycle can be initiated by:
- the controller will turn on the A/D indication per the Fault Coding Table 2.9, and continue to operate using default values as described below.
- the A/D fault will continue to be displayed for as long as the fault exists.
- the fault lights will turn off if the A/D fault is cleared.
- Indicators shall be flashed on for 0.3 seconds separated by 0.3 seconds off.
- EEPROM data may be modified by transmitting the proper programming command to the controller.
- Communications protocol with the controller is set at 600 baud, 1 start bit and 1 stop bit.
- the fault code will be shared as the fault code value +128. This allows the control to return with the fault code displayed in the event of a power loss.
- the controller will respond to a keypress by either blinking the appropriate indicator on and off indicating that the controller will change to the desired mode once the current operation is complete or will turn on the indicator full and immediately change to the desired mode as outlined throughout this document.
- a TEMPERATURE SENSOR OUT OF RANGE fault allows for normal keyboard operation.
- the fault display is not cleared when the "OFF" key is pressed.
- the fault display will be cleared once a valid (in-range) temperature is sensed.
- All switches except for the main power switch are to be miniature micro switches mounted on the board in a manner to allow a decal overlay on the control box cover with the following key pads:
- Indicators are to be provided for the following:
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Production, Working, Storing, Or Distribution Of Ice (AREA)
- Electrophonic Musical Instruments (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
TABLE 2.2.4 ______________________________________ End of Cycle Fan Off Delay Time Values END OF CYCLE FAN OFF Discharge Temperature DELAY Time ______________________________________ <Discharge Temp 1EOCFOD 1 Discharge Temp 1 -Discharge EOCFOD 2Temp 2 Discharge Temp 2 -Discharge EOCFOD 3Temp 3 >Discharge Temp 3EOCFOD 4 ______________________________________ Note: END OF CYCLE FAN OFF DELAY times and temperatures are defined in 2.11 EEPROM Locations and Timing Resolution Table.
TABLE 2.3.4 ______________________________________ FLUSH LEVEL INDICATION INDICATOR LED'S FLUSH BIN LEVEL FULL FREEZE HARVEST CLEAN OFF ______________________________________ 1 off off off off on 2 off off off on on 3 off off on on on 4 off on on on on 5 on on on on on ______________________________________
TABLE 2.9 ______________________________________ Fault Coding FLASH PROBLEM LED COUNT ______________________________________ General Water Water ContinuousWater Pump Water 1 WaterInlet Solenoid Water 2 General Refrigeration Refrigeration Continuous (Low Discharge or Long Freeze) Harvest Problem -Cubes Refrigeration 1 Sensed Harvest Problem -No Cubes Refrigeration 2 SensedHigh Discharge Refrigeration 3 Temperature Sensor Out of Water & Continuous Range Refrigeration ______________________________________
FREEZE; HARVEST; OFF; CLEAN
______________________________________ FAULTS STATUS ______________________________________ 4.1 WATER RED 4.3 FREEZE GREEN 4.2 REFRIGERATION RED 4.4 HARVEST GREEN 4.5 CLEAN GREEN 4.6 OFF GREEN 4.7 BIN FULL GREEN ______________________________________
Claims (9)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/873,633 US5901561A (en) | 1997-06-12 | 1997-06-12 | Fault restart method |
GB9812508A GB2327774B (en) | 1997-06-12 | 1998-06-10 | Fault restart method |
DE19826006A DE19826006B4 (en) | 1997-06-12 | 1998-06-10 | Procedure for restarting in case of failure |
IT98MI001330A ITMI981330A1 (en) | 1997-06-12 | 1998-06-11 | RESTARTING METHOD AFTER INTERRUPTION OF OPERATION |
JP10164558A JP3088098B2 (en) | 1997-06-12 | 1998-06-12 | Failure restart method |
CNB98114733XA CN1163710C (en) | 1997-06-12 | 1998-06-12 | Fault restart method |
TW087109420A TW438955B (en) | 1997-06-12 | 1998-07-22 | Fault restart method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/873,633 US5901561A (en) | 1997-06-12 | 1997-06-12 | Fault restart method |
Publications (1)
Publication Number | Publication Date |
---|---|
US5901561A true US5901561A (en) | 1999-05-11 |
Family
ID=25362021
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/873,633 Expired - Lifetime US5901561A (en) | 1997-06-12 | 1997-06-12 | Fault restart method |
Country Status (7)
Country | Link |
---|---|
US (1) | US5901561A (en) |
JP (1) | JP3088098B2 (en) |
CN (1) | CN1163710C (en) |
DE (1) | DE19826006B4 (en) |
GB (1) | GB2327774B (en) |
IT (1) | ITMI981330A1 (en) |
TW (1) | TW438955B (en) |
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Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6581393B2 (en) | 1995-09-01 | 2003-06-24 | Nartron Corporation | Ice making system, method, and component apparatus |
US6282909B1 (en) * | 1995-09-01 | 2001-09-04 | Nartron Corporation | Ice making system, method, and component apparatus |
US6339930B2 (en) * | 2000-05-01 | 2002-01-22 | Technology Licensing Corporation | Ice thickness control system and sensor probe for ice-making machines |
US20070157636A1 (en) * | 2003-03-13 | 2007-07-12 | Billman Gregory M | Icemaker control system |
CN100337076C (en) * | 2003-05-22 | 2007-09-12 | 乐金电子(天津)电器有限公司 | Automatic controlling method for ice maker |
US7343749B2 (en) | 2003-06-24 | 2008-03-18 | Hoshizaki Denki Kabushiki Kaisha | Method of operating auger ice-making machine |
EP1491832A1 (en) * | 2003-06-24 | 2004-12-29 | Hoshizaki Denki Kabushiki Kaisha | Method of operating auger ice-making machine |
US20040261427A1 (en) * | 2003-06-24 | 2004-12-30 | Hoshizaki Denki Kabushiki Kaisha | Method of operating auger icemaking machine |
US7062925B2 (en) | 2003-06-24 | 2006-06-20 | Hoshizaki Denki Kabushiki Kaisha | Method of operating auger icemaking machine |
US20060150642A1 (en) * | 2003-06-24 | 2006-07-13 | Hoshizaki Denki Kabushiki Kaisha | Method of operating auger ice-making machine |
US20060230777A1 (en) * | 2005-02-09 | 2006-10-19 | Manfred Gradl | Refrigerator and/or freezer comprising an ice-cube maker |
US7921667B2 (en) * | 2005-02-09 | 2011-04-12 | Liebherr-Hausgeraete Lienz Gmbh | Refrigerator and/or freezer comprising an ice-cube maker |
US20060277928A1 (en) * | 2005-06-14 | 2006-12-14 | Manitowoc Foodservice Companies | Residential ice machine |
EP1734319A2 (en) * | 2005-06-14 | 2006-12-20 | Manitowoc Foodservice Companies, Inc. | Residential ice machine |
US7281386B2 (en) * | 2005-06-14 | 2007-10-16 | Manitowoc Foodservice Companies, Inc. | Residential ice machine |
EP1734319A3 (en) * | 2005-06-14 | 2014-09-10 | Manitowoc Foodservice Companies, Inc. | Residential ice machine |
US9032745B2 (en) | 2007-04-27 | 2015-05-19 | Whirlpool Corporation | Ice imaging system |
US8156748B2 (en) | 2007-04-27 | 2012-04-17 | Whirlpool Corporation | Ice quality sensing system employing digital imaging |
US20100046793A1 (en) * | 2007-04-27 | 2010-02-25 | Whirlpool Corporation | Ice quality sensing system employing digital imaging |
US20090314016A1 (en) * | 2007-04-27 | 2009-12-24 | Whirlpool Corporation | Ice imaging system |
JP2014504718A (en) * | 2011-01-31 | 2014-02-24 | マニトワック・フードサービス・カンパニーズ・エルエルシー | Refrigeration and harvest control in safe mode of ice making machine and method thereof |
US10605514B2 (en) * | 2011-02-02 | 2020-03-31 | Robert Almblad | Positive air pressure ice making and dispensing system |
US11421928B2 (en) * | 2011-02-02 | 2022-08-23 | Robert Almblad | Positive air pressure ice making and dispensing system |
US20170227274A1 (en) * | 2011-02-02 | 2017-08-10 | Robert Almblad | Positive air pressure ice making and dispensing system |
US20130327069A1 (en) * | 2012-06-08 | 2013-12-12 | General Electric Company | Icemaker shut off method for premature harvest reduction |
US8857198B2 (en) * | 2012-06-08 | 2014-10-14 | General Electric Company | Icemaker shut off method for premature harvest reduction |
US20160069601A1 (en) * | 2013-01-21 | 2016-03-10 | Whirlpool Corporation | Ice Maker |
US9976786B2 (en) * | 2013-01-21 | 2018-05-22 | Whirlpool Corporation | Ice maker |
US10054352B2 (en) * | 2015-04-09 | 2018-08-21 | True Manufacturing Co., Inc. | Methods and apparatuses for controlling the harvest cycle of an ice maker using a harvest sensor and a temperature sensor |
US10890368B2 (en) | 2015-04-09 | 2021-01-12 | True Manufacturing Co., Inc. | Methods and apparatuses for controlling the harvest cycle of an ice maker using a harvest sensor and a temperature sensor |
US20160298893A1 (en) * | 2015-04-09 | 2016-10-13 | True Manufacturing Co., Inc. | Methods and apparatuses for controlling the harvest cycle of an ice maker using a harvest sensor and a temperature sensor |
US10254032B2 (en) | 2016-07-15 | 2019-04-09 | True Manufacturing Co., Inc. | Ice discharging apparatus for vertical spray-type ice machines |
US10557656B2 (en) | 2016-07-15 | 2020-02-11 | True Manufacturing Co., Inc. | Ice discharging apparatus for vertical spray-type ice machines |
CN111166204A (en) * | 2019-07-18 | 2020-05-19 | 九阳股份有限公司 | Cleaning method of food processing device |
CN113525456A (en) * | 2021-08-18 | 2021-10-22 | 湖南中车时代通信信号有限公司 | Control method and device for magnetic-levitation train and control platform |
Also Published As
Publication number | Publication date |
---|---|
JPH1151527A (en) | 1999-02-26 |
GB9812508D0 (en) | 1998-08-05 |
GB2327774A (en) | 1999-02-03 |
DE19826006A1 (en) | 1998-12-24 |
CN1163710C (en) | 2004-08-25 |
GB2327774B (en) | 2001-10-24 |
JP3088098B2 (en) | 2000-09-18 |
CN1203352A (en) | 1998-12-30 |
ITMI981330A1 (en) | 1999-12-13 |
DE19826006B4 (en) | 2005-10-06 |
TW438955B (en) | 2001-06-07 |
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